GPIO 27 -> DHT
GPIO 34 (ADC1_6) -> MQ-a
GPIO 33 (ADC1_5) -> MQ-b
GPIO 32 (ADC1_4) -> MQ-c
GPIO 35 (ADC1_7) -> MQ-d
GPIO 16 -> GPS TX
GPIO 17 -> GPS RX
GPIO 5 -> MMC CS
GPIO 18 -> MMC SCK
GPIO 19 -> MMC MOSI
GPIO 23 -> MMC MISO
GPIO 21 -> CLOCK SDA 
GPIO 22 -> CLOCK SCL
Obs.: MMC_VCC -> 5V
